Gas burner spud



Aug. 3o, 1932. l E A HA. 1,874,970

y GAS BURNER SPD Filed April 3, 1951 Fig. l. 2.

Patented Agg. V3o, 1932 e UNITED s'luxvrus PA'rENfr` OFFICE i ERNEST A. HALL, OF- TOLEDO, 0510, ASSIGNORJIYO THE COLUMBIA BURNER COMPANY, OF TOLEDO, OQEIIO, A CORPORATION F OHIO i GAS BURNER SPUD This invention relates to improvements in 'gas burner spuds or tubes adapted to be used on burners for domestic and industrial heat# in or wherever gas 1s used as a fuel.

as burnersheretoforeused for this pur- I pose have been so designed that the gas and mixing air are directed through the burner tubewith the whole or a portion lof the air in enveloping relation to the gas, or with an air pencil or stream extending from the outer end of the spud to the gas-supply jet thereof and in contact with the side wall of the Spud. A spud of this type will perform its function ver well when thegas pressure is suiiiciently igh or when it is used with light gravity gas, but when it is used with low gas plessure or with heavy gravity gas or with t e and urn down in the mixingtube or in the gas orifice, thus resulting in incomplete combustion and causing carbon to lform in the tube and on the walls' of appliances.

- It is the object of this invention'to provide a gas burner spud especially adapted for use with heavy gravity gas under very low pressurefand more particularly a spud which permits the gas to be turned down to burn a iame which is very small and' low in gas consumption and which. will not flash or burn back in the mixing-tube or orifice-,when used under such conditions.

The invention will be more particularly described in connection with the accompanying drawing, in whichl of Fig. 1; and

4Figure 1 is a central longitudinal section of the improved spud; Y v

Figure 2 is anenlarged longitudinal sectionthrough the'base of the spud with the gas orifice lnsert'shown in perspective;

Fi re 3 is a section taken on the line 3-3 Fi re 4 is a section of Fig. 1.

As illustrated in the-drawing,the comprises a'tub'nlar body 6 having a reduced taken-on the line fle-4 Q threaded end 1f( adapted to be connected with the gas supply line'8. The spud and the end of t `e supply line 8 are. preferably formed with tapered machined surfaces 9 adapted to insure a. gas-tight joint without the use of a gas turned low, the flame will flash back' stream or pencil of gas surrounded byair tol travel up the center of the tube. With this ing within the tube or oriiices. It will burn with natural at a pressure as high as-eight compound or packing, whenever the spud is screwed into operative position.

The spud is provided at its base with an inlet( throat 10, which as a manufacturing proposition is preferably in the form of a bushing or insert rather than an integral part of the spud. The ,base of this insert -is chamfered, as shown at 11, tofacilitate the flow of gas. The top of the insert is, inthe present instance, reduced as shown at 12 and is provided with two outlet orifices 13, diametrically opposite each other and so directed that thestreams of gas are discharged in an upwardly inclined direction and substantially in a tangential direction with respect to the wall of the mixing chamber 14:. Thus the gas discharged from these orifices flows upwardly in spiral streams and in immediate contact with the wall of the spud. While the contour of the passageway 70 through the spud may be ofvarious forms, it is preferably `formed,'as shown in Figure 1 with a restricted .portion or venturi .15 i a ove the chamber 14 and then becomes gradually larger in diameter, as `shown at 16, toward the upper endof the spud. Air openin gs 17 are provided near the base ofthe spud. A With theconstruction shown, the gas will flow upwardly in a spiral course, as indicated by the arrows b, and will gradually spread out and expand, forming a gaseous envelope in immediate contact f/with thewall of the Spud as it emerges from the upper end thereof. The air, which iiows in through theopenings 17, will ascend `inside of the gaseous enl velope, as indicated by the arrows a, and,4

entire length of the tube, which not only 90,

causes a better mixture of gas .and air, but

causes the mixture to cling to the outside wall of the tube and at no time allows a single condition the spud will burn on pressure of a small fraction-'of an inch aslmeasured by the water-glass, without flashing back or burninches without blowing away. The same wardly atan inclination and'approximately l A tangential to the inside -surface of the body Spud may be used either with artificial or manufactured gaswith satisfactory results.

While Ihave shown and described s ecii-` vcallyl one form of the invention, it is to e understood that the same may be modified considerably without departing from the salient features of the invention which is primarily designed to cause the gas rather than the air to come in Contact with thewall of the spud.

. What I claim is:

1. A gas burner spudcomprising a tubular body provided with a gas inlet directed 11pto directgas in spiral form around the in\ terior Wall of the body, said body havin an air inlet at the side of the gas inlet to a :t e alir to the central portion of the body withln the spiral gas stream. v 2. A gas burner spud comprising a tubular body provided with a plurality of equidistant gas inlets arranged to direct streams vof gas` spirally along the inside surface 0f the body -to provide a ,tubular gas streamv within the4 body in contact therewith substantially throughout its length, said body bengprov' vided with air inlets between the gas `inlets and arranged to admit air to thecentral portion of said body within the'gas stream and spaced thereby from the body.

3. A gas burner spud comprising a tubular body provided with a plurality'of equidistant gas inlets inclined upwardly and approx# imately tangential to the' inside surface of the body, whereby to cause streams of gas to flow i`n spiral paths upwardly along the inside surface of said body, saidbody being provided with air inlets between the gas in` lets and' arranged to admit air to the een,

tral portion of said body within the gas stream and spaced thereby from-the body.

'In testimony whereof I have hereunto d signed my name to this specification.

ERNEST A. HALL. 

